a mystery of a special kind

Two stars - for the processing, if one wants to be just ...
but as it ends there - until today puzzles I like someone from the accompanying aluminum clamps two identical landing gears may be composed?
I thought it was an oversight on the product image, but, really, there were three small and one large pipe clamps - brooding ...
I've still not managed (to be honest, has this kit already in many items for various construction projects disbanded on copter), on request at flug51 there was no reaction.
So I ask times those who have managed to give me a tip on how and where you attach the second vertical pipe at the elbow!
just out of curiosity ;-)